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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw material and subassemblies $ 269,062 $ 224,239
Work-in-progress 61,624 44,344
Finished goods 144,159 120,179
Total inventories $ 474,845 $ 388,762